Audio Conversion API — Free Tier + Pay-As-You-Go

curl -X POST https://api.convertintomp4.com/v1/convert \
  -H "X-Api-Key: ck_your_api_key" \
  -F "file=@input.wav" \
  -F "targetFormat=mp3"
  -F "audioBitrate=192k" \
  -F "sampleRate=44100"

import { readFileSync } from "node:fs";
import { ConvertIntoMP4Client } from "convertintomp4";

const apiKey = process.env.CIM4_API_KEY;
const client = new ConvertIntoMP4Client({ apiKey });

// Presigned direct-to-R2 upload, then queue the conversion.
const { jobId } = await client.uploadDirect(
  readFileSync("input.wav"),
  "input.wav",
  "application/octet-stream",
  { targetFormat: "mp3" },
);

// Poll until the job reaches a terminal state.
let job;
do {
  await new Promise((r) => setTimeout(r, 2000));
  job = await fetch(`https://api.convertintomp4.com/v1/status/${jobId}`, {
    headers: { "X-Api-Key": apiKey },
  }).then((r) => r.json());
} while (job.status !== "completed" && job.status !== "failed");

console.log("Download URL:", job.result?.downloadUrl);

import time, requests
from convertintomp4 import Client

api_key = "ck_your_api_key"
client = Client(api_key=api_key)

# Presigned direct-to-R2 upload, then queue the conversion.
with open("input.wav", "rb") as f:
    job = client.upload_direct(
        f, "input.wav", "application/octet-stream", "mp3"
    )

# Poll until the job reaches a terminal state.
while True:
    status = requests.get(
        f"https://api.convertintomp4.com/v1/status/{job['jobId']}",
        headers={"X-Api-Key": api_key},
    ).json()
    if status["status"] in ("completed", "failed"):
        break
    time.sleep(2)

print("Download URL:", status.get("result", {}).get("downloadUrl"))